Table 2.

Demographic variables and survey feedback responses for the total sample (N = 982)

	Frequency %
Age, years
18–29	22.4
30–39	21.6
40–49	23.3
50–59	20.7
60–69	8.6
70 and over	3.5
Highest level of education
None	1.2
Primary school	0.2
Secondary school	21.1
Sixth form	27.6
Degree or vocational	38.0
Postgraduate	11.1
Other	0.8
Family history of RA2
Definitely not	21.4
Probably not	20.9
Don’t know	24.9
Probably	16.6
Definitely	16.2
Smoking
Yes	22.2
Never	54.6
No, but have in the past	23.2

Mean (SD)	Median
SILS (5-point scale; higher score, higher health literacy)
4.27 (1.17)	5.00
SNS-3 total (higher score indicates higher numeracy)
13.10 (3.72)	14.0
Perceived likelihood developing RA in the future
3.14 (0.90)	3.00

	Frequency %
Understanding DCE
Very easy to easy	71.7
Not easy to not difficult	20.7
Difficult to very difficult	7.6
Understanding PTT
Very easy to easy	64.7
Not easy to not difficult	23.4
Difficult to very difficult	11.9
Answering DCE
Very easy to easy	59.8
Not easy to not difficult	27.0
Difficult to very difficult	13.2
Answering PTT
Very easy to easy	55.6
Not easy to not difficult	27.5
Difficult to very difficult	16.9

DCE discrete choice experiment, PTT probabilistic threshold technique, RA rheumatoid arthritis, SD standard deviation, SILS Single Item Literacy Screener, SNS-3 3-Item Version of the Subjective Numeracy Scale